The solution that contains a solution of transition-metal ions with partially filled d orbitals will have color.
Transition metals are known to have incompletely filled d orbitals. The transition metals occupy the center of the periodic table between group 2 and group 13 in the main group.
Due to d - d transitions that occur in transition elements having partially filled d orbitals, they have colored solutions. Hence, in the observation, a colored solution may indicate the presence of a transition metal ion.
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